
In the last section, we climbed along the ledges to the far right corner of the subterranean lake. Continuing from there, turn left and take another running jump across the pool to grab the angled, light blue block directly opposite. Pull up.

Now we're aiming for the long, light blue slope above. This slope isn't too steep, but its height makes a standing jump tricky. So instead, turn left, walk to the middle of the angled block, then pivot to face the end of the long, light blue slope.

Hop back and take a running jump...

...to land on the flat ledge beyond the slope. Turn around, jump up onto the long slope (it's safe), then vault up onto the light blue block, which will then be on your left.

Walk to the far right corner of this block and look over the edge to spot a long, light blue ledge below.

To reach it,stand close to the corner, angled to the right, and run off the edge...

...to land on the ledge below. Take care not to run off the far edge.

Take a few steps forward, then a standing jump onto the dark blue block below, near the cavern wall.

Turn so the cavern wall is on Lara's right. Then take a running jump across the water to grab the next ledge.

Pull up, move to the left end of this ledge, turn right, and then take a running jump across the water into the cave opening. Great job! The hard part is over. Now to get that key.

Follow the tunnel up and around to the right.

After the second bend, you'll come to a steep, light-colored slope. There's a guy with a shotgun (8) lurking up ahead. If you jump up the slope...

...get a pistol lock on him, then flip side to side while firing, you can kill him without taking much damage.

Steal his shotgun ammo (7) and continue up the tunnel. Pass by the opening on the left for now (this leads to the TOP DECK) and continue straight on...

...to a hole in the floor with a large medi pack (8) nearby. Get that health meter up to 100%.

Then safety drop through the opening onto the INFLATABLE RAFT, losing about 90% of your health in the fall.

Take the CABIN KEY (9) and 2 bunches of harpoons (10-11).

The achievement/trophy "A Land Walk" should unlock when you pick up the key, assuming you didn't swim in the lake beforehand.
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